Add NEXRAD data provider function to get time points by date

test/source/scwx/provider/aws_level3_data_provider.test.cpp

@@ -66,6 +66,26 @@ TEST(AwsLevel3DataProvider, GetAvailableProducts)
    EXPECT_GT(products.size(), 0);
 }
 
+TEST(AwsLevel3DataProvider, GetTimePointsByDate)
+{
+   using namespace std::chrono;
+   using sys_days = time_point<system_clock, days>;
+
+   const auto date     = sys_days {2021y / May / 27d};
+   const auto tomorrow = date + days {1};
+
+   AwsLevel3DataProvider provider("KLSX", "N0Q");
+
+   auto timePoints = provider.GetTimePointsByDate(date);
+
+   EXPECT_GT(timePoints.size(), 0);
+   for (auto timePoint : timePoints)
+   {
+      EXPECT_GE(timePoint, date);
+      EXPECT_LT(timePoint, tomorrow);
+   }
+}
+
 TEST(AwsLevel3DataProvider, TimePointValid)
 {
    using namespace std::chrono;

wxdata/include/scwx/provider/aws_nexrad_data_provider.hpp

@@ -26,17 +26,20 @@ public:
    AwsNexradDataProvider(AwsNexradDataProvider&&) noexcept;
    AwsNexradDataProvider& operator=(AwsNexradDataProvider&&) noexcept;
 
-   size_t cache_size() const;
+   size_t cache_size() const override;
 
-   std::chrono::system_clock::time_point last_modified() const;
-   std::chrono::seconds                  update_period() const;
+   std::chrono::system_clock::time_point last_modified() const override;
+   std::chrono::seconds                  update_period() const override;
 
-   std::string FindKey(std::chrono::system_clock::time_point time);
-   std::string FindLatestKey();
+   std::string FindKey(std::chrono::system_clock::time_point time) override;
+   std::string FindLatestKey() override;
+   std::vector<std::chrono::system_clock::time_point>
+   GetTimePointsByDate(std::chrono::system_clock::time_point date) override;
    std::pair<size_t, size_t>
-   ListObjects(std::chrono::system_clock::time_point date);
-   std::shared_ptr<wsr88d::NexradFile> LoadObjectByKey(const std::string& key);
-   std::pair<size_t, size_t>           Refresh();
+   ListObjects(std::chrono::system_clock::time_point date) override;
+   std::shared_ptr<wsr88d::NexradFile>
+                             LoadObjectByKey(const std::string& key) override;
+   std::pair<size_t, size_t> Refresh() override;
 
 protected:
    std::shared_ptr<Aws::S3::S3Client> client();

wxdata/include/scwx/provider/nexrad_data_provider.hpp

@@ -101,6 +101,17 @@ public:
    virtual std::chrono::system_clock::time_point
    GetTimePointByKey(const std::string& key) const = 0;
 
+   /**
+    * Gets NEXRAD data time points for the date supplied. Lists and adds them
+    * to the cache if required.
+    *
+    * @param date Date for which to get NEXRAD data time points
+    *
+    * @return NEXRAD data time points
+    */
+   virtual std::vector<std::chrono::system_clock::time_point>
+   GetTimePointsByDate(std::chrono::system_clock::time_point date) = 0;
+
    /**
     * Requests available NEXRAD products for the current radar site, and adds
     * the list to the cache.

wxdata/source/scwx/provider/aws_nexrad_data_provider.cpp

@@ -9,6 +9,7 @@
 
 #include <aws/s3/model/GetObjectRequest.h>
 #include <aws/s3/model/ListObjectsV2Request.h>
+#include <fmt/chrono.h>
 
 namespace scwx
 {
@@ -156,6 +157,45 @@ std::string AwsNexradDataProvider::FindLatestKey()
    return key;
 }
 
+std::vector<std::chrono::system_clock::time_point>
+AwsNexradDataProvider::GetTimePointsByDate(
+   std::chrono::system_clock::time_point date)
+{
+   const auto day = std::chrono::floor<std::chrono::days>(date);
+
+   std::vector<std::chrono::system_clock::time_point> timePoints {};
+
+   logger_->debug("GetTimePointsByDate: {}", day);
+
+   std::shared_lock lock(p->objectsMutex_);
+
+   // Is the date present in the date list?
+   if (std::find(p->objectDates_.cbegin(), p->objectDates_.cend(), day) ==
+       p->objectDates_.cend())
+   {
+      // Temporarily unlock mutex
+      lock.unlock();
+
+      // List objects, since the date is not present in the date list
+      ListObjects(date);
+
+      // Re-lock mutex
+      lock.lock();
+   }
+
+   // Determine objects to retrieve
+   auto objectsBegin = p->objects_.lower_bound(day);
+   auto objectsEnd   = p->objects_.lower_bound(day + std::chrono::days {1});
+
+   // Copy time points to destination vector
+   std::transform(objectsBegin,
+                  objectsEnd,
+                  std::back_inserter(timePoints),
+                  [](const auto& object) { return object.first; });
+
+   return timePoints;
+}
+
 std::pair<size_t, size_t>
 AwsNexradDataProvider::ListObjects(std::chrono::system_clock::time_point date)
 {